Cementing material and method of making the same.



IINITEED %T.A .TE% PATENT @FFIQE.

HUGH RODMAN, OF PITTSBURG, PENNSYLVANIA.

CEMENTING MATERIAL AND METHOD OF MAKING THE SAME.

No Drawing.

To all whom it may concern: Be it known that I, HUGH RODMAN, a citizenof the United States,and a resident ofabout May 15, 190,91 havedisclosed a -,ce-

menting or case hardening material composed of coke, and an energizinsubstance as for example lime and soda-ash, properly ground or powderedand mixed in proper proportions. By energizing substance, I mean suchmaterial, not necessaril carbonaceous material, as will when adde to aninactive carbonaceous substance, render such :carbonaceous substanceactive, as a carbonizing agent. The lime of such a mixture tends tocarbonate upon exposure to the air and the soda-ash to dissolve if themixture be comes wet. I have discovered that such material may beprotectedjso that the lime con stituent thereof will not carbonate northe soda-ash dissolve by coating the material with a substance such asoil or a solid hydro carbon such as asphaltum. L v

In order to properly coat the material, it

is preferably heated in a vesselto somewhat above the boiling point of-\vater and to this is added about ten per cent. by weight. of o il orasphaltum while the mass is being stirred. The result isa carbonaceousparticle coated with a hydrocarbon covering in which is embedded theenergizing substance, as lime and soda ash; The material in this mannermay be thoroughly coated so that it will not be liable to atmosphericdeterioration nor will it deteriorate if it becomes wet, I also findthat by coating the material in this manner the proper proportions ofthe separate constituents of the material Wili Specification of LettersPatent.

remain throughout the mass for an indefinite period; owing to thespecific gravities of the several constituents when the material is notcoated they tend to separate, the heavier and smaller particles settlingto the bottom. This coating, therefore, accomplishes the double objectof preventing deterioration and maintaining a homogeneous mixture.

Having thus described my invention, what I claim is:

-1. The method of preventing deterioration in the cementing or casehardening compounds containing carbonaceous and energizing substanceswhich consists in coating the carbonaceous particles with a. protectingsubstance carrying the energizing substance.

2. The method of preventing deterioration in cementing or case hardeningmaterial comprising a mixture of substances of different specificgravitie's which consists in coating one of the substances with a tackywater proof substance in which is embedded another substance.

' 3. Cementi'n material comprising a mixture of severaI substances ofdifferent specific gravities and a tacky water proof substance holdingthe subst-ances'in predeter-, mined proportions.

i 4. Cementing material consisting of a'mixture of carbonaceousmaterial, an energizing I substance and a tacky water proof substance,

the energizing substance being embedded in the water proof substance.

5. .Cementing material consisting of a car bonaceous substance and ahydrocarbon protector containing an energizing substance.

6. Cementing material consisting of a car bonaceous base and a tackybinder containing an energizen.

n testimony whereof, I have hereunto subscribed my name this 1st day ofApril,

HUGH RUDE/IAN. Witnesses:

Bmnnr Hines, E. McCAtus'rna.

Patented Feb. 15, 191$.

Application filed April 3, 1908. Serial No. 424,893.

